David Lim wrote:Is it also clear what kind of genitive it is now? (What can "της πιστεως υμων" which is also "της πιστεως εμου" mean?)

Thanxs for the detailed explanation - I see it now - it is clearly a possessive genitive ("your faith"). What threw me was having the prepositional phrase ἐν ἀλλήλοις in between the article τῆς and the noun πίστεως